Deep Sky Object in Winter
Around Sh2-227, 228 (Diffused Nebulae in Auriga)


Click on image to enlarge

Date & Time: Dec 24 2022, from 25:31 to 27:369 JST(+0900)
Mosaic of 2 flames of 8min.×6shots
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-D1 Light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial+SBIG STV
CMOS Camera: ZWO ASI2600MC Pro (Cooled temp.: -25°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...16bit FITS, converted to 16bit TIFF(6248×4176)
Device Size...23.5×15.7mm, Gain...100



Sh2-227 / Diffused Nebula, type 5 R
R.A.05h 19m 51.0s (2000.0)
Dec.+38° 55' 00" (2000.0)
Apparent Size22.5'
Real Size80 light yrs.
Magnitude -
Distance14,000 light yrs.
Other IDs LBN 781
NGC1857 / Open Cluster, type I 3 m
R.A.05h 20m 06.0s (2000.0)
Dec.+39° 20' 36" (2000.0)
Apparent Size5.0'
Real SizeN/A
# of Stars40
Magnitude7.0“™
DistanceN/A
This image captures the faint Hα nebulae and open star clusters scattered around μAur, which is located 7.5 degrees south of Capella in the pentagon of Auriga. Sh2-227 is a nebula with an apparent diameter of over 20 arc minutes in the upper left. It is almost circular, and you can see that there is unevenness inside. You can see a small open cluster of NGC1857 in 0.5 degrees north of the nebula, about 40 member stars have been gathered in 5 arc minutes in diameter. The cluster looks unexpectedly striking because of its high star density.
Small red nebulae are located in the lower right of the field. Sh2-226 is 2 arc minutes in size, and Sh2-228, which is visible 45 arc minutes southeast of it, is the most photographable of these nebulae and has an extension of about 8 arc minutes. A little reddish nebula less than 1 degree to the east is IC2120, which is about 1 minute in size. Although the detailed structure is not clear in this picture, it has been classified as a planetary nebula.
Sh2-226 / Diffused Nebula, type 3 E
R.A.05h 11m 06.7s (2000.0)
Dec.+37°59' 33" (2000.0)
Apparent Size2.0'
Real Size8 light yrs.
Magnitude -
Distance13700 light yrs.
Other IDsLBN 780
Sh2-228 / Diffused Nebula, type 1 E
R.A.05h 13m 35.0s (2000.0)
Dec.+37°27' 11" (2000.0)
Apparent Size8.0'
Real Size26 light yrs.
Magnitude -
Distance11400 light yrs.
Other IDsLBN 783
IC2120 / Planetary Nebula,
R.A.05h 18m 10.4s (2000.0)
Dec.+37°33' 28" (2000.0)
Apparent Size60.0"
Real Size1.2 light yrs.
Magnitude -
Distance4160 light yrs.
Other IDsPK 169-0.1

Nebulae & Star clusters around Sh2-227, 228 Nebulae & Star clusters around Sh2-227, 228

Italic indicates ID of open clusters




Sh2-223, 224

Around Sh2-232


Copyright(c) 2022 by Naoyuki Kurita, All rights reserved.
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